# Viking DHC-6-400 - Type: Aircraft model (FAA registry) - Registry code: 5026494 - Manufacturer (registry): VIKING AIRCRAFT - Model: DHC-6-400 - Aircraft type: Fixed wing multi engine - Category: Airplane - Engines: 2 · Turbo-prop - Seats: 21 - Weight class: 12,500 to 19,999 lb - Certification: Type certificated - Data sheet: [TCDS A9EA](https://openairdocs.org/tcds/A9EA) (OpenAirDocs) - Holder: De Havilland Aircraft of Canada Limited - Registered aircraft: 0 - Page: https://openairdocs.org/model/viking-dhc-6-400 Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker. ## ADs that may apply (OpenAirDocs) Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023 - [AD 2022-11-12](https://openairdocs.org/ad/2022-11-12): Engine Controls · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Jul 13, 2022 - [AD 2022-11-09](https://openairdocs.org/ad/2022-11-09): Wing Structure · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Jul 6, 2022 - [AD 2022-10-07](https://openairdocs.org/ad/2022-10-07): Flight Control System · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Jun 23, 2022 - [AD 2022-10-03](https://openairdocs.org/ad/2022-10-03): Flight Control System · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Jun 23, 2022 - [AD 2022-07-14](https://openairdocs.org/ad/2022-07-14): Aircraft Fuel System · Viking Air DHC-6-400. Effective May 13, 2022 - [AD 2022-03-04](https://openairdocs.org/ad/2022-03-04): Time Limits · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Mar 17, 2022 - [AD 2019-10-05](https://openairdocs.org/ad/2019-10-05): Flight Controls · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Jun 20, 2019 - [AD 2018-04-02](https://openairdocs.org/ad/2018-04-02): Flight Controls · Viking Air DHC-6-1, DHC-6-100, DHC-6-200 and 2 more. Effective Mar 27, 2018 - [AD 2012-26-15 R1](https://openairdocs.org/ad/2012-26-15-R1): Navigation · Agusta AW139, A318-111, A318-112 and 70 more. Effective Dec 3, 2014 Historical (superseded or no longer in force): - [AD 2012-26-15](https://openairdocs.org/ad/2012-26-15) (historical): Navigation · Agusta AW139, A318-111, A318-112 and 71 more. Effective Jan 24, 2013 ## Registered aircraft None registered with this model now. ## NTSB investigations None matched to aircraft with this model. ## FAA accident and incident reports None matched to aircraft with this model. ## Service difficulty reports (23) As reported by operators and repair stations, by the model named in the report. - [SDR G7HA202307130001](https://openairdocs.org/sdr/G7HA202307130001), Jul 13, 2023: DISTRIBUTION VLV. BURNED. ON TEN OCCASIONS SINCE 2020, PILOTS REPORTED THE UNCOMMANDED INFLATION OF ALL THEIR DEICE BOOTS AT ONCE DURING TAKE-OFF. ON EVERY OCCASION, THEY WERE ABLE TO RE - [SDR 8G9R705D](https://openairdocs.org/sdr/8G9R705D), May 23, 2022: SWITCH. INOPERATIVE. AIRCRAFT NLG DID NOT RETRACT AFTER TAKEOFF. ABLE TO LAND WITHOUT INCIDENT. UPON INSPECTION, TECHNICIANS FOUND CENTERING SWITCH OUT OF ADJUSTMENT. TECHNICIANS CO - [SDR 2021F00206](https://openairdocs.org/sdr/2021F00206), Jul 22, 2021: CIRCUIT CARD. SHORTED. ON JULY 22, 2021 AT APPROXIMATELY 0920, INFLIGHT AND IN IMC WHILE PERFORMING THE RNAV RWY 5 APPROACH INTO PAAD THE CREW EXPERIENCED A TEMPORARY LOSS OF VERTICAL - [SDR CA190808010](https://openairdocs.org/sdr/CA190808010), Aug 8, 2019: SCREW. WRONG PART. (CAN) DEFECT DESCRIPTION DWG: C6CF1225 REV U. IN ASSY 3, 6 AN526-632R4 SCREWS WERE FOUND NONCONFORMING, NOT IN SAFETY OF THE ANCHOR NUT ON THE C6CF1244-3 FWD CO - [SDR CA190807008](https://openairdocs.org/sdr/CA190807008), Aug 6, 2019: ROD END. CORRODED. (CAN) MSN 974 LEFT ENGINE FAILED TO RETURN TO LOWER POWER SETTING DURING TAXI THIS MORNING. WHEN L/H POWER LEVER RETURN TO IDLE POSITION THE NG STILL 68%, R/H I - [SDR CA190528017](https://openairdocs.org/sdr/CA190528017), May 28, 2019: WASHER. MISSING. (CAN) QTY 2 COTTER PINS MS24665-132 AND QTY 2 WASHERS AN960PD316L WERE NOT INSTALLED AS SHOWN IN MANUFACTURING DRAWINGS. VIKING IS CONTINUING TO INVESTIGATE (TC - [SDR 2019FA0000164](https://openairdocs.org/sdr/2019FA0000164), May 27, 2019: CONTROL QUADRANT. LOOSE. THE QUADRANT ON RUDDER TORQUE TUBE WAS FOUND TO HAVE MOVEMENT BETWEEN THE TUBE AND THE QUADRANT. UPON LAST INSTALLATION A INDEX LINE WAS PLACED ON THE TUBE AND - [SDR 2019FA0000163](https://openairdocs.org/sdr/2019FA0000163), May 27, 2019: CONTROL QUADRANT. LOOSE. THE QUADRANT ON RUDDER TORQUE TUBE WAS FOUND TO HAVE MOVEMENT BETWEEN THE TUBE AND THE QUADRANT. UPON LAST INSTALLATION A INDEX LINE WAS PLACED ON THE TUBE AND - [SDR 2019FA0000162](https://openairdocs.org/sdr/2019FA0000162), May 27, 2019: CONTROL QUADRANT. LOOSE. THE QUADRANT ON RUDDER TORQUE TUBE WAS FOUND TO HAVE MOVEMENT BETWEEN THE TUBE AND THE QUADRANT. UPON LAST INSTALLATION A INDEX LINE WAS PLACED ON THE TUBE AND - [SDR 2019FA0000161](https://openairdocs.org/sdr/2019FA0000161), May 27, 2019: CONTROL QUADRANT. LOOSE. THE QUADRANT ON RUDDER TORQUE TUBE WAS FOUND TO HAVE MOVEMENT BETWEEN THE TUBE AND THE QUADRANT. UPON LAST INSTALLATION A INDEX LINE WAS PLACED ON THE TUBE AND - [SDR 2019FA0000160](https://openairdocs.org/sdr/2019FA0000160), May 27, 2019: CONTROL QUADRANT. LOOSE. THE QUADRANT ON RUDDER TORQUE TUBE WAS FOUND TO HAVE MOVEMENT BETWEEN THE TUBE AND THE QUADRANT. UPON LAST INSTALLATION A INDEX LINE WAS PLACED ON THE TUBE AND - [SDR CA190522024](https://openairdocs.org/sdr/CA190522024), May 9, 2019: CONTROL ROD. DAMAGED. (CAN) ON THE 9TH OF MAY DURING PRE-FLIGHT CHECKS ON DQ-FLA (MSN: 968) THE CONTROL ROD ASSY (PN: C6FS5018 3) ON THE DOOR AIRSTAIR CABIN WAS FOUND DAMAGED. UPON F - [SDR CA190528016](https://openairdocs.org/sdr/CA190528016), May 8, 2019: SUMP. MALFUNCTIONED. (CAN) SEVERAL SUMPS DISPLAYED VARIOUS DEGREES OF FUEL SEEPAGE DURING THE PAINT INSPECTION AT SPOKANE ON APRIL 15. THE SUMPS WERE CLEANED AND DRIED AT THAT TIME - [SDR CA190528018](https://openairdocs.org/sdr/CA190528018), Apr 26, 2019: ROD END. DAMAGED. (CAN) VSC30-3A ROD ENDS MAY HAVE CONDITIONS. MISSING HARD CHROME PLATING OF ROD END BALL AS PER VSC30 REV A. DEFECTS FOUND ON BEARING RACE SUCH AS NICKS, JAGGED - [SDR CA190418011](https://openairdocs.org/sdr/CA190418011), Apr 15, 2019: SCREEN. CORRODED. (CAN) MAU COOLING FAN SCREEN FOUND CORRODED AND WITH PIECES MISSING. VIKING IS CONTINUING TO INVESTIGATE. ATA 31 (TC# 20190418011) - [SDR CA190412002](https://openairdocs.org/sdr/CA190412002), Apr 7, 2019: ROD END. FAILED. (CAN) ROD END FAILED DUE TO CORROSION. HAS REQUESTED THE PARTS TO BE RETURNED FOR INVESTIGATION. (TC# 20190412002) - [SDR CA190327025](https://openairdocs.org/sdr/CA190327025), Mar 21, 2019: PRESSURE SWITCH. INTERMITTENT. (CAN) HYDRAULIC PRESSURE SWITCH P/N P12M-H185 S/N 102 WAS SNAGGED FOR INTERMITTENT OPERATION PRIOR TO A/C DEPARTURE. - [SDR CA190424021](https://openairdocs.org/sdr/CA190424021), Nov 18, 2018: HOSE. LEAKING. (CAN) HOSE SPLIT AND LEAKING. - [SDR CA180616005](https://openairdocs.org/sdr/CA180616005), May 28, 2018: PROBE. FALSE INDICATION. (CAN) FALSE INDICATION OF AMOUNT OF FUEL ATA 28-00. (TC# 20180616005) - [SDR CA180616004](https://openairdocs.org/sdr/CA180616004), May 28, 2018: PRESSURE SWITCH. BROKEN. (CAN) FALSE INDICATION OF AMOUNT OF FUEL ATA 28-00. (TC# 20180616004) - [SDR CA180616003](https://openairdocs.org/sdr/CA180616003), May 12, 2018: PRESSURE SWITCH. FLUCTUATES. (CAN) HYDRAULIC PRESSURE SWITCH PRE MOD 6/2313 DROPS TO 1220 PSI. OUTSIDE THE PERMISSIBLE LIMIT, SWITCH OPENS AT INCONSISTENT PRESSURES IN 1480, 1520,1500 PSI`S - [SDR CA180404016](https://openairdocs.org/sdr/CA180404016), Apr 2, 2018: CONTROL CABLE. CHAFED. (CAN) DURING THE EMMA 2 INSPECTION IT WAS DISCOVERED THAT THE LEFT HAND AILERON CABLE WAS CHAFING ON THE STEERING CABLE AT THE BASE OF THE YOKE. THE CHAFING OCC - [SDR CA180222018](https://openairdocs.org/sdr/CA180222018), Jan 24, 2018: PUMP. FAILED. (CAN) FORWARD BOOT PUMP 1 FAILURE ON TAXI IN AT GLA. (TC NR 20180222018). ## STCs that may be installed (OpenAirDocs) (88, first 50) Approved for this model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has. - [STC SA1841NM](https://openairdocs.org/stc/SA1841NM): Installation of larger windows and the lowering of the seats. Twin Otter STC Holdings, LLC - [STC SA12430IB](https://openairdocs.org/stc/SA12430IB): Installation of the Garmin G1000 NXi Integrated Flight Deck System. Aerocorp Avionics Solutions Inc - [STC SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC - [STC SA943EA](https://openairdocs.org/stc/SA943EA): Replacement of de Havilland wing bleed air ducting with alternate ducting. Texas Air Services Inc - [STC SA03749NY](https://openairdocs.org/stc/SA03749NY): Installation of Garmin G950 Integrated Flight Deck System. Aerocorp Avionic Solutions Inc - [STC SA12101IB](https://openairdocs.org/stc/SA12101IB): Installation of Cabin Interior Upgrade. De Havilland Aircraft of Canada Limited - [STC SA00887LA](https://openairdocs.org/stc/SA00887LA): Installation of Pitot Heater Fail Lights. Team J.A.S - [STC SA02556LA](https://openairdocs.org/stc/SA02556LA): Installation of Passenger Utility Seats. Team J.A.S - [STC SA02649LA](https://openairdocs.org/stc/SA02649LA): Installation of Max-Viz 2300 Enhanced Vision System. Team J.A.S - [STC SA02730LA](https://openairdocs.org/stc/SA02730LA): Installation of High-Flow 250 AMP Starter-Generators. Team J.A.S - [STC SA02806LA](https://openairdocs.org/stc/SA02806LA): Structural Provisions for AFT Camera Hatch. Team J.A.S - [STC SA04046CH PAGE 2](https://openairdocs.org/stc/SA04046CH%20PAGE%202): Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500). Acron Aviation Inc - [STC SA09887AC](https://openairdocs.org/stc/SA09887AC): Installation of an Avionica MK-III mini Quick Access Recorder (QAR) and optional 4G or LTE Avionica Cellular Module (avCM. Aircraft Systems and Manufacturing Inc - [STC SA39CH](https://openairdocs.org/stc/SA39CH): Installation of an Amphibian Landing Gear Position Advisory System/Laser Gear Advisory System. Wipaire Inc - [STC SA02386AK](https://openairdocs.org/stc/SA02386AK): Replacement of existing landing and/or taxi light reflector and bulbs with Light Emitting Diode (LED) lighting systems. AeroLED's Holding LLC - [STC SA00345BO](https://openairdocs.org/stc/SA00345BO): Installation of an NVIS / NVG Compatible Lighting System. ATI Engineering Services LLC - [STC SA00196IB](https://openairdocs.org/stc/SA00196IB): Installation of the Replacement Aluminum Cargo Floor Panels. Rocky Mountain Aircraft - [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc - [STC SA00157IB](https://openairdocs.org/stc/SA00157IB): Installation of the Cabin Audio System Upgrade. Unity Aviation Canada Ltd - [STC SA00085IB](https://openairdocs.org/stc/SA00085IB): Installation of Elevator Replacement Trailing Edge. Rocky Mountain Aircraft - [STC SA02010WI](https://openairdocs.org/stc/SA02010WI): Installation of the Mid-Continent Instruments & Avionics MD23 FLEX Custom Function Display (CFD). Mid-Continent Instruments and Avionics - [STC SA00076IB](https://openairdocs.org/stc/SA00076IB): Installation of Photo luminescent Safety Systems. STG AEROSPACE GERMANY GmbH - [STC SA04482CH](https://openairdocs.org/stc/SA04482CH): INSTALL TELEDYNE FLIR INC STAR SAFIRE 380-HDc FLIR IMAGING SYSTEM WITH LASER RANGE FINDER (LRF). MAG AEROSPACE - [STC SA04550AT](https://openairdocs.org/stc/SA04550AT): Main Wheel and Brake Assembly for the Viking Air DHC-6 Series aircraft. PMA Design and Manufacturing - [STC SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC - [STC SA04701NY](https://openairdocs.org/stc/SA04701NY): Replacement of Fixed Wing Control Cables. Thunder Bay Aviation Ltd - [STC SA04698NY](https://openairdocs.org/stc/SA04698NY): Approval of an Controlled Aircraft Equipment Configuration providing for the authorized use of Transmitting Portable Electronic Devices (TPED). Kilroy Aviation LLC - [STC SA00282NY](https://openairdocs.org/stc/SA00282NY): Replacement latches on upper and lower cargo door. PMA Design & Manufacturing Inc - [STC SA04587NY](https://openairdocs.org/stc/SA04587NY): Installation of Acorn Welding C6SC1107-NG Exhaust stacks. Acorn Welding Ltd - [STC SA09856AC](https://openairdocs.org/stc/SA09856AC): Installation of BendixKing Aerowave 100 In-flight Data Link System for non-essential, non-required aircraft Cabin Systems & Equipments. Honeywell International Inc (Bendix King) - [STC SA04651NY](https://openairdocs.org/stc/SA04651NY): Aft Lavatory Installation. Viking Air Limited - [STC SA02265SE](https://openairdocs.org/stc/SA02265SE): Installation of a camera housing. Airborne Sensor LLC - [STC SA09894AC](https://openairdocs.org/stc/SA09894AC): Installation of Night Vision Goggle (NVG) compatible lighting system in Viking Air Limited Model DHC-6-300 modified. Aero Dynamix Inc - [STC SA04623NY](https://openairdocs.org/stc/SA04623NY): Installation of Type 1 (PAA Design group) DHC-6 Twin Otter Seats. Regent Aircraft Services - [STC SA04595NY](https://openairdocs.org/stc/SA04595NY): Installation of STC-AT-141. AIRBORNE TECHNOLOGIES GmbH - [STC SA04575NY](https://openairdocs.org/stc/SA04575NY): Installation of IKHANA Station 332 Bulkhead Door. IKHANA Aircraft Canada Inc - [STC SA04284NY](https://openairdocs.org/stc/SA04284NY): Installation of the K-A Band Antenna and system provisions. airplus engineering GmbH - [STC SA04565NY](https://openairdocs.org/stc/SA04565NY): Installation of the Replacement Cabin Roof Escape Hatch. Rocky Mountain Aircraft - [STC SA02267LA](https://openairdocs.org/stc/SA02267LA): Approves the Viking Air Limited DHC-6-300 and DHC-6-400 landplanes to take off and land at a maximum weight of 14,000 pounds and DHC-6-300 and DHC-6-400 floatplanes to take off and land at a maximum weight of 13,600 pounds. IKHANA Group Inc - [STC SA02627LA](https://openairdocs.org/stc/SA02627LA): Installation of wing hardpoints. IKHANA Group Inc - [STC SA04486CH](https://openairdocs.org/stc/SA04486CH): EMS conversion in accordance with Spectrum Aeromed Master Drawing List 6080DL, Revision: 1 (One), dated September 22, 2020, or later FAA approved revisions. Spectrum Aeromed LLC dba Spectrum Aeromed - [STC SA04514NY](https://openairdocs.org/stc/SA04514NY): Single/Dual Transponder System ADS-B Upgrade. Scandinavian Avionics Design ApS - [STC SA04444CH](https://openairdocs.org/stc/SA04444CH): Installation of Forward-Looking Infrared Radar (FLIR) System Provisions in accordance with MAG Aerospace Master Data List, Doc. No. 2020006-MDL-100, Revision F, dated June 23, 2020. MAG Aerospace - [STC SA04437NY](https://openairdocs.org/stc/SA04437NY): Installation of the VIP Club Seating. IKHANA Aircraft Canada Inc - [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit. Med-Pac Inc - [STC SA04458AT](https://openairdocs.org/stc/SA04458AT): Installation of the PMA Design and Manufacturing nose landing gear (NLG) shock strut assembly. PMA Design & Manufacturing Inc - [STC SA03768NY](https://openairdocs.org/stc/SA03768NY): Installation of Enhanced Air Conditioning System. IKHANA Aircraft Canada Inc - [STC SA00344BO PAGE 2](https://openairdocs.org/stc/SA00344BO%20PAGE%202): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies - [STC SA03266NY](https://openairdocs.org/stc/SA03266NY): Installation of a Cockpit (crew) Oxygen System. IKHANA Aircraft Canada Inc - [STC SA00355BO](https://openairdocs.org/stc/SA00355BO): Installation of a Ballistic Protection System. MAG Aerospace All 88: https://openairdocs.org/model/viking-dhc-6-400/stcs.md ## The same model under other registry codes Amateur-built copies and renamed makers get their own codes. - [Viking Air DHC-6-400](https://openairdocs.org/model/viking-air-dhc-6-400): 4 registered aircraft, registry code 9502640 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.